Portable derrick



Dec.v Z, 1927.

' J. HANSEN PoRTABLE nmucx 2 Sheets-Smet 1 Filed April 21. 1925 ne f6 7'25 2 Sheets-Sheet 2 l QN @v www mw vas l to themast, and comprises a'platform 7,-

Patented Dec. 20, 1927.

UNITED erg-,ArasV PATENT oFFIca y JENsHANsEmoF SUPERIOR, WISCONSIN.

PORTABLE D11-:BRICK` A Appucation mea Apru 21,1923.: serial N9. 133,779.A

gitudinally of the beam.- The yopposite end. of the load beamisnprovided with'a loadl compensating weight, Icapable 'of adjustment flongitudinallyl ofthe beam to vvary its.y com- '.pensatingeffct on"theload in. accordance j with'the=`weight of that load Thusfthe derricl;is adaptedv to-handle loa-dsA whichv ordinarilycould not be taken care.of with#y out' the adjustable compensating weight.

The loadfbeam is adapted for rotation about a iiXed standardor mast, andthis ro'-V tation is `controlled at willfand `in vdegree byl theoperator, land the rmovably-supported base forthe derrick isprovided'with meansl wherebythe derrickxmay lbe shifted from place toplace, as: desired. i vThe invention is lillustrated in the accompanyingdrawings, -showing the preferred construction, and in which':-4k

Fig. 1 is a p'erspectlve view ofthe iIn-v j 1s provided nearftheupperend lwith a pinproved derrick. f

Fig. 2 is a longitudinalsection through the load beaml Y t Fig. 3 is atransversejsection ytakenjjust above .the platform.l

Fig. 11 is a sectional View, the

platform mounting.

The improved derrick comprises a basel,

preferably of skeleton metallic formatiom'. mounted on self-adjustingwheels yor :rollers 2, l to permit movementl `of' ,the derrickv from`place to place.'

A bed plate 3 is supported'above the base by 'inclined` struts '4:rising. fromthe base, and ajmast 5 is secured in a block 6,-carried byfa,cross framegsecured vto the bas'e,.theY

mast rising through the bed' plate to an appropriate height, and beingthus fixed with end shafts or aXles'28, carrying wheels or relation to'the 'base 1.'; v i

The movable portion of the derrick superstructure is mounted forrotation relative supportedon the .bed plate. 3' through a ball bearing8, and a load-beam 9 arranged near the upper end; of the. mast, andVsupported a lower plate 14. on which the beam rests.

from the platform 7 by linclined framing bars 10.

' The load beam comprises a skeleton framework, preferably rectangular,and provided with a sleeve' bearing portion 11 hav-V ing ball-bearingconnection at the upper and j lower ends with the mast, the sleeveinclud- 1ng an upper plate 12 from which the load beam issupported byhanger braces 13, and

`Itis to be particularly noted that the load beam is of unequal lengthsvon the respective sides of the mast-bearing' sleeve, the one or loadside, indicated generally at 15 being of less length than the other orcompensating side, indicated at 16. The frame bars making up the loadbeam properare angle bars, the horizontal portions forming trackways 17while the vertical portions are connected with the upper 4sleeve, plate12 by adjustablev tiev bars 18. j

The superstructure isthus 4freely rotatable about *the mastv as'an axisto position the load beam for picking up or delivering the load, andthe' load beam/is manually controlled in this'turning movement,through,y

a'rod mounted at the upper end in the lower sleeve plate 14, and at thelower 'end in one of the side plates 19 connecting the inclinedframingbars 10 on each side. Thisrod 20 ion 21, Aadapted tok engage agear secured on the mast 5, a pinion 22 being secured on the rod Ynearthe lower end to engage a gear 23 supported in one of the side plates19. The sha-ft of the gear 23` extends beyond the side plate and isshaped to receive a handle 24, whereby the rod may be turned, rand thusthe superstructureV moved on the mast as a center to any desiredposition.

The trackways 17 ofthe load beam Support two carriages 25 and 26 fortrav-el on opposite sides of the sleeve 11, one carriage 25 beinghereinafter termed the load carriage, and thev other, 26, beinghereinafter termed the compensating carriage. These carriages aresubstantially identical vrin construction, and comprise bodies 27,having rollers 29 for'free travel on the trackways 17.

The carriages are designed to be adjusted lengthwise the trackways inaccordancewith conditions, as hereinafter pointed out, and thisadjusting means is designed forcontrol bythe operator; In vt-he caseofthe load carriage 25, an operating cable 30 is terminally wound aboutone drum 31 of a two-drum shaft 32 mounted in the side plates 19, thiscable 30 extending upwardly and over one pulley of a three-pulley block33 secured to a collar 34 fixed to the sleeve 11. The cable 30 thenextends over a pulley of a. two-pulley block 35 secured to one end ofthe carriage, then over aI second pulley of block 33 then over thesecond pulley of block 35, and terminally secured to the carriage. Theremaining cable for this load carriage. as 36,-` is reversely woundabout the other drum'37 on shaft 32. and extends' upwardly over theAremaining block of the pulley block 33,

thence to the extreme end of the load side" of the beam, over a pulleyof a: two-pulley block 38, secured tothe load beam, rearward ly to andover a pulley of a two-pulley block 39, secured to the proximate endofthe' carriage, Athen forwardly over the remaining pulley' of block 38,back over the remaining pulley of block 39,` and' terminallyl secured tothe carriage.

The compensating carriage is arranged for control in an identicalmanner, that is a cable 40 is mounted on one drum 41 of a two drum shaft42 mounted in the side plates 19, this cable cooperating withl apulley-block 43 on the sleeve 11 and a pulley block 44 on thecompensating carriage, similar toi the connect-ion of the cable 30 withthe load carriage. A second cable 45 wound about they second drum 46 ofshaft 42, cooperates with the pulleyv block 43, with pulley block 4'? atthe end of the load beam, and with a pulley block 48 on the carriage,the arrangement being similar to the connection ofthe cable 36 withcarriagef25. 1

The drum shafts 32` and 42 have geared connection with adjacentcountersli-afts 49 and 50, respectively, these counter shafts being'mounted inthe side plates 19, and being formed beyond one of such`plates for the reception of operating handles, whereby the carriages maybe moved to any desired posrtion lengthwise the trackways 17, as will beevident.

A load lifting means, such as a cable 51 is suspended from the. loadcarriage 25, and desir-ed` pulley-multiplication for this cable beingprovided, and the end of `the cable being wound over a drum 52 on shaft53, mounted iny the side plates 19, and geared to a countershaft 54mounted in the side y plates and adaptedfor opera-tion by a hanhungtherefrom in a mann-er te permit itsreplac-ement when necessary.` Thisweight acts as a counterbalance to the load being lifted, and it isappare-nty that'by moving the respectivecarriages to appropriaterelative distances lfrom the sleeve 11, the weight may be made tocounterbalance any load.

The load end of the beam is of less length than-the compensating end,and hence the weight may be positioned through movement of the carriageon which it is supported to different distances from the sleeve l11,,and thus offset the weight effect of the particular load'on the beam...This arrangement .per-

y-m-its the derrick to handle loads whic'h'it could. nototh-erwisehandle without tipping the load beam.

The 'derrick as a whole is adapted tol be moved from place to place, andfork convenience inshifti-ng the 'derrick thel load cable i passed tocenter the same relativey toV the base'.

form 7 is positioned a.bove-the,base a sufficient distance to allowtheoperator posi'-l tioned on such. platform ai viewi ofthev work inhand, and may be'y convenient of access through a ladder or steps` 61.

Itl is to be particularly imted that thecontrol of bot-hv carriages, thecontrol ofthe load cable, and the turning' of the -super-Y 'structure asa whole, isiV withiny the convenient reach and government of a singleoperator',

thus enabling'one man to arrange the co'un- V terbalance andposition'the load. carriage, operate the load lifting' cable,y andE turnthe" superstructure, through manipulation of the proper crank handles,without leavinghis:

position on the plat-forni'-` Having thus described,Y the what isclaimed. as' new, isz-f- Y Y 1. In a portable` derrick', a movabletbase', a1 mast rising therefrom and rigidly secured thereto, a platformrotatabley on the mast above" the base, a load beam rotatable on themast-above the platform, means for rotatably supporting the beam atspaced points inventiom on the mast, and bearings interposed at such'spaced points and below the platform.

2. In a portable derric'k, a base, a mast secured thereto ,and risingtherefrom, a-bed plate encircling the mastl and carried by thebase, aplatform supported for rotative movement onv said bed plateand relative'to-V the mast, a bearing between the platform and bed plate,.a loadbeam extending in both di'- rections beyond the mast, al sleeve formingpart of said load beam and' adapted tobe-arlis y rangedV alignmentlwith'y the mast, and up per and lower' bearings between' said sleeveand mast.

3..v In a` portablev derrick, a base` a. mast' secured thereto andrising therefrom, a bed plate encircling the mast and carried by thebase, a platform supported for rotative movement on said bed plate andrelative to the mast, a bearing between the platform and bed plate, aload beam extending in both directions beyond the mast, a sleeve formingpart of said load beam and adapted to be arranged in alignment with themast, upper and lower bearings between said sleeve and mast, frame bars`arranged intermediate the platform and load beam to rigidly connectYlate encircling the mast and carried by the ase, a platform supportedfor rotative movement on said bed plate and relative to the mast, abearing between the plat-form and bed plate, a load beam extending inboth directions beyond the mast, a. sleeve forming part of said loadbeam and adapted to be arranged yin alignment with the mast', upper and.lower bearings between said sleeve and mast, and means for rotating theplatform and load beam including a rod movable with Y,

the platform and independently rotatable, means for rotating the rod, apinion carried by the upper end of the rod, and a gear fixed on the mastto be engaged by the pinion.

In testimony whereof, I aix my signature.

JENS HANSEN.

